Finally, I have a time to actually answer my own question! LOL
For me, it varies from story to story because different people read and review different stuff, but a lot of you guys have been amazing reviewers of my stuff. Tracy is the one Rose and I can always count on to review our collaborations, usually before anyone else! Steph is willing to give anything a shot, which is such an admirable trait (coming from a picky reader like me), and she always leaves fantastic reviews. Mare is great about leaving detailed, honest feedback and, as others have said, coming from someone who has had success with both fanfic and published original fiction, any compliment from her means a lot. And Rose is so supportive of everything I do, even the projects that take my focus away from our collaborations; I can always count on her to make me laugh in her reviews!
I also have to mention Jen (FrickFrackGirl or JennayHeartNic
k), who doesn't post much on AC but has been an AMAZING reader of mine, especially when it comes to Broken and By My Side. She not only read and gave feedback on every chapter of those stories as I was writing them, but she has re-read them and recommended them to others and still mentions them from time to time on Twitter. To still get that kind of praise for a series I started 10 years ago is astounding to me, but I love her for it!
Like the rest of you, I also have those authors who I looked up to for a long time before they read anything of mine, and feedback from them meant the world to me! I loved getting feedback from Jenna and Swenglish, who wrote Swollen Issues, for Broken because their story was what inspired the idea for Broken in the first place.
Also, thanks for the mentions!